System and method for preventing false alarm of NDIR alarm apparatus

Abstract

The invention relates to a system and method for preventing a false alarm of an NDIR alarm apparatus. The system comprises an NDIR gas sensor, a temperature and humidity sensor, a controller and an alarm module, wherein the NDIR gas sensor is used for detecting concentration of a detected gas and sending the detected gas concentration to the controller; the temperature and humidity sensor is usedfor detecting temperature and humidity of an ambient environment and sending the detected temperature and humidity to the controller; the controller is used for receiving data sent by the NDIR gas sensor and the temperature and humidity sensor and controlling start and stop states of the NDIR gas sensor according to the data sent by the temperature and humidity sensor as well as issuing an alarm instruction to the alarm module; the alarm module is used for giving an alarm according to the alarm instruction issued by the controller. In the system, the temperature and humidity sensor is extra added, and a method that whether the temperature and humidity sensor is in fault is judged is added, so as to guarantee the effect that the NDIR gas sensor can accurately detect the concentration of thedetected gas, and a user is prompted by virtue of the alarm when the temperature and humidity greatly influence detection on the concentration of the detected gas or the temperature and humidity sensor is in fault.

Description

technical field [0001] The invention relates to the technical field of preventing false alarms, in particular to a system and method for preventing false alarms of an NDIR alarm. Background technique [0002] NDIR (infrared gas sensor) adopts the method based on the gas absorption theory. After the infrared radiation emitted by the infrared light source is absorbed by the gas to be measured at a certain concentration, the spectral intensity proportional to the gas concentration will change, so that the spectrum can be obtained. The amount of change in intensity can invert the concentration of the gas to be measured. [0003] However, in the actual gas measurement process, the sensor is often affected by factors such as temperature, air pressure, humidity, etc., resulting in a decrease in measurement accuracy and stability. Therefore, in the prior art, a temperature and humidity sensor module is added inside the NDIR gas sensor to calibrate the measurement data, but this met...

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Problems solved by technology

[0003] However, in the actual gas measurement process, the sensor is often affected by factors such as temperature, air pressure, humidity, etc., resulting in a decrease in measurement accuracy and stability

Therefore, the existing technology adds a temperature and humidity sensor module inside the NDIR gas sensor to calibrate the measurement data, but this method has a slow response speed and does not output an alarm signal to remind the user, which is not conducive to the user experience related to the alarm.

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